ALCO Updates

New Product

ALCO Shield Black MAG Underlayment
. More...

Installation Guide

ALCO Shield Detail Drawings
ALCO Shield Underlayment Installation Instructions & Drawings
are now available Online. Click Here to View...

Product Highlights

Granular+ Underlayment

The NEW & Improved ALCO Shield GRANULAR+ is now available. More...

ALCO Roof Repair Tape
24/7 Roof Repair Tape - Now available - Leak and Seam Repair Tape for TPO, EPDM, and Metal with Ultra Aggressive Sealability. More...

ALCO Warranty Information


Call Toll Free 
800-323-0029 for information on where to buy ALCO Roof Products.


ALCO Products

Alco-Sield Smooth Ice & Water Protector


ALCO Shield™ GRANULAR+ Ice and Water Protector is designed for use as a shingle underlayment in critical areas of the roof, such as eaves, valleys, ridges, dormers and skylights. ALCO Shield GRANULAR+protects roof structures and the interior from water penetration caused by ice dams and wind driven rains.

ALCO Shield GRANULAR+ is a polymer modified asphalt membrane, glass fiber reinforced with a granular surface providing skid and tracking resistance during installation, as well as sealing around the shingle fasteners for the life of the shingles.


ALCO Shield Granular Ice & Water Protector
The ALCO Shield GRANULA+ underlayment product offers a high degree of skid resistance combined with the highest standards of manufacturing.



  • Self-adhering, but initially repositionable for easy installation
  • High tack back adhesive provides for all season installation
  • Granular surface provides the anti-skid feature to keep workers safe
  • Exceptional manufacturing process and quality control for a consistent product
  • Meets or exceed industry standards and residential/commercial Model Building Codes
  • Made in Detroit - USA


  • Prevents water intrusion and seepage from wind-driven rain, ice dams and around fasteners
  • Self-Sealing: Seals around nails, staples and screws
  • Self-Adhering: Bonds directly to the roof substrate
  • Skid Resistant: Granular surface for safe and easy installation
  • Excellent for under asphalt shingles

> View Installation Instructions & Detailed Drawings

> Download PDF Data/Technical Specifications Sheet

> Architectural Specifications